<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            background: red;
            /* 
            scalex:宽度放大
            scaleY:高度放大
            scale:高度宽度一起
             */
            transform: scalex(1)
        }
    </style>
</head>
<body>
    <div>

    </div>
</body>
</html>